Jeep Wagoneers (full size) and Wranglers used pan hard bars (trak bars) with leaf springs in the 80's and 90's, They were mounted with solid mounts on the axles. If you remove them for rock crawling the body sway is greater. The stock rubber spring bushings provided enough give to have a fairly smooth and stable ride. Tim
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Yes, a prperly designed, seet up, and installed watts is superior to a panhard. However, it takes a fair amount of calculation to ensure that.
A panhard would be an easier install and achieve similar lateral location duties and could, potentially, allow the same adjustment. Either one would require modifications to the spring eye mounting and shackle bushings to allow the springs to pivot otherwise there is high potential for binding as the leafs and lateral device fight for control of the springs. Since the torsional rigidity of the springs resist roll, creating pivoting springs means they may also need to step up in rate slightly to achieve the same roll rate.
I still think for OP's request for slightly firmer handling on a street car, it is easier acheived with in increase in spring rates, better shocks, maybe even a rear sway bar if the roll couple isn't hugely off.
